Zenith Chronomaster Revival El Primero A384 2024 [Preowned]Overview The Zenith Chronomaster Revival El Primero A384 03. A384. 400 21. C815 pays homage to the brand's storied history, particularly its pioneering work in chronograph development during the late 1960s. The A384 is a direct reference to the original model launched in 1969, which was celebrated for its innovative El Primero movementthe first automatic chronograph movement. This revival captures the essence of the original while incorporating modern